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Summary of Contents for Calian SatService sat-nms LBRX-1MT
- Page 1 sat-nms LBRX-1MT L-Band Beacon Receiver User Manual Version 2.0 / 2011-11-10 © Copyright SatService Gesellschaft für Kommunikatiosnsysteme mbH Hardstrasse 9 D-78256 Steisslingen www.satnms.com www.satservicegmbh.de Tel +49 7738 99791-10 Fax +49 7738 99791-99...
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Page 2: Table Of Contents
Table Of Contents Table Of Contents ..........................1 Introduction ............................2 Installation ............................2.1 Safety Instructions ........................2.3 Connecting the Receiver ....................... 2.4 Configuring the Receiver ......................2.5 Mechanical installation ......................... 3 Operation / Remote Control ........................ 3.1 Command syntax .......................... 3.2 Framed Protocol ......................... - Page 3 (C) 2020, SatService GmbH www.satnms.com LBRX-1MT-UM-2002 Page 2/21...
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Page 4: Introduction
1 Introduction T he sat-nms LBRX-1MT L-band beacon receiver manufactured by SatService GmbH is a measurement tool which measures the RF input level and provides this information as output signal for control systems. The LBRX-1MT is a special version of the standard sat-nms L-band beacon receiver which is optimised for a high measurement rate and fast data read out. - Page 5 (C) 2020, SatService GmbH www.satnms.com LBRX-1MT-UM-2002 Page 4/21...
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Page 6: Installation
2 Installation This chapter describes how to install the sat-nms LBRX beacon receiver. You find a guide how to connect, configure and mechanically mount the receiver below. Before you start, please first read the Safety Instructions chapter below. It contains some important recommendations to prevent damage from the receiver. - Page 7 The connectors of the receiver are placed on both sides. One side contains the D/C and Data connectors, the other side the RF connectors. When you connect the receiver, please consider the following: The fault relays at J1 are Photo MOS solid state circuits. In fault state or while the unit is powered off they are in hi-Z state (several MOhms).
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Page 8: Configuring The Receiver
J5 RF Input (SMA female) J6 RF Output (SMA female) 2.4 Configuring the Receiver This chapter gives a short overview about some configuration parameters you want to set after you have installed the sat-nms LBRX beacon receiver. A complete reference of all available setup parameters is given in chapter 3 Operation / Remote Control. - Page 9 The receiver enclosure is DIN rail mountable. Hence simply snap the receiver on to the rail to fix it. For plain wall mount, fix a 270 mm piece of DIN rail at the wall with at least two screws and lock the receiver on this.
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Page 10: Operation / Remote Control
3 Operation / Remote Control The LBRX-1MT beacon receiver does not provide any local control interface. It is controlled remotely through a serial RS232 interface. At this interface, the receiver provides two different protocol modes: After power on, the receiver wakes up in terminal / ASCII protocol mode. In this protocol mode, commands may be entered and terminated by a carriage return character. -
Page 11: Framed Protocol
A complete list of the parameter the beacon receiver knows is shown later in this document in chapter "3.4 Parameter list". Below, some common rules applying to the remote control message syntax are summarised. Parameter names always are of lower case letters, four characters long. Non-numeric parameter values always are written in upper case. -
Page 12: Rs422 Streaming Interface
the the terminal / ASCII protocol. This means in particular: After one start character ({) of the framed protocol has been received, the device switches to framed protocol mode and subsequently ignores every input which is not packed in a valid protocol frame. To return to the terminal / ASCII protocol mode, switch off the receiver and switch it on again. -
Page 13: Parameter List
the RS422 streaming output port of the sat-nms LBRX-1MT: double get_lbrx_level() { unsigned char c; unsigned val; double level; while (1) { c = get_byte_from_lbrx(); if (c & 0x80) { val = c & 0x7f; c = get_byte_from_lbrx(); if ((c & 0x80)==0) { val = (val <<... -
Page 14: Detailed Parameter Descriptions
adcv r/o 0 65535 Raw ADC value aout r/o 0.0 .. 10.0 Analog output voltage attn 0 10 20 30 Attenuation daco -200 .. 0 Analog output offset dacs -5.0 .. 5.0 V/dB Analog output scale dflt r/o OK FAULT D/C supply fault edge 0 .. - Page 15 receiver printed circuit board. The temperature at this place normally is about 20°C above the environment temperature, hence temperature readings at 65°C are not unusual. lbfr (L-Band Frequency, MHz) Querying this parameter returns the L-Band frequency the receiver is tuned to. tflt (Receive Level Fault, OK/FAULT) If the receive level falls below the alarm threshold which can be set with the thrh parameter, the receiver responds 'FAULT' or 'OK' if if the level is above the...
- Page 16 Analog output configuration dacs (Analog output scale) This parameter defines the slope of the receiver's voltage output in V/dB. The output voltage has a range of 0 .. 10 V. Setting this parameter to 0.25V/dB lets the analog output cover a dynamic range of 40 dB. The scale value may be negative, which lets the output voltage fall for rising input level values.
- Page 17 sver (Software version) Querying this parameter returns the software version installed. (C) 2020, SatService GmbH www.satnms.com LBRX-1MT-UM-2002 Page 16/21...
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Page 18: Theory Of Operation
4 Theory of Operation The beacon RX receives a satellite beacon signal which is down-converted to L-Band by a PLL stabilised Low Noise Converter (LNC) at its L-band interface input. The beacon RX does not demodulate any satellite because the satellite signals are sometimes CW signals but also very often modulated in FM or BPSK form. Due to this fact the best implementation is a non-coherent receiver which measures the input level in a user selectable defined bandwidth and provides this as a dB-linear and calibrated analogue output voltage and digital information. - Page 19 This mixer converts the 70MHz IF into the final 455kHz IF by use of 1/10 the frequency of the fractional- N synthesiser. The 455kHz IF signal is the fed into a one of four analog multiplexer circuit. Via the internal micro controller the appropriate bandwidth of 6, 12 30 and 100KHz is selectable.
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Page 20: Processing Of Measured Values
interfaces. See chapter '3 Operation / Remote Control' for details. 4.2 Processing of Measured Values The logarithmic detector circuit outputs a dB-proportional voltage to the A/D converter. Hence the measured ADC samples reflect directly the receiver's input power in dBm. The readings however are subject to vary by temperature. -
Page 21: Specifications
5 Specifications The table below summarises the beacon receiver's specifications: RF Specification Input frequency range 950 to 2050 MHz Frequency Step Size 1 KHz L-Band Input Connector SMA female 50 Ohm LNC voltage OFF/14/18V L-Band Test Output Connector SMA female 50 Ohm Input Noise Figure <... - Page 22 Weight 1,5 kg (C) 2020, SatService GmbH www.satnms.com LBRX-1MT-UM-2002 Page 21/21...